edited contact model and created participant model
Merge remote-tracking branch 'upstream/master'
added scopes to participant
add validations to org_user and edited membership a little
Merge pull request #37 from psethu/master

Fixed some view issues on show pages. Added some css and content to home page.
Merge pull request #39 from jschiang/master

wrote org_user and participant models
Merge branch 'master' of https://github.com/sankalpk/gelfand